[Vwdiesel] Analyzing compression numbers - oil in injector hole?

[mark shepherd]

Ooops forgot to ponder on the rest of the posting
Oil in the prechamber... Are you sure it was oil and not dirty diesel?
If oil was leaking through a crack then it would be defying the higher 
pressure of the chamber, I guess it could get past a ring with a duff oil 
scraper. Coolant oil being historic seems viable. The low pressure in one 
cylinder is a little out of spec...
Mark
----- Original Message ----- 
From: "Will Taygan" <william at taygan.com>
To: <vwdiesel at vwfans.com>
Sent: Friday, November 16, 2007 11:47 PM
Subject: [Vwdiesel] Analyzing compression numbers - oil in injector hole?


>I compression tested the 91 ecodiesel a month ago and got
> 450-480-450-400.  (the 94 TD was 450-500 on all 4!)
>
> It starts well when cold, starts well when hot, but there's a zone when
> it's just warm and the glow plugs don't come on that it cranks for a few
> seconds before it catches.  Engine? Pump? Glow Sensor?  The afterglow is
> 7 seconds, so I just double-glow the 7 second period (no light, just
> current) and things usually improve.
>
> I found a good teaspoon of oil in the #4 injector hole (lowest
> compression cylinder) when I pulled it.  I've never seen that before.
>
> There is some trace oil in the coolant overflow.  Looks like it had a
> blown headgasket that someone repaired and now there's just a film on
> the plastic.  Maybe a few pencil-dot sized specks of oil floating in
> there.
>
> I'm not too worried about it, just curious.  Ideas? Theories?
>
> Will.
>
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